it uses the headphone jack as the ADC. the app is called huskerscope.
i made this little board to allow me to have an input
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I’m gonna have to build me one now
That’s insane. I love it.
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I imagine the ADC has a high-pass filter. The low sample rate (usually 48kHz) could also be an issue
You can also use your phone as a 2-channel function generator using https://play.google.com/store/apps/details?id=com.keuwl.functiongenerator. Maybe you could use both at the same time to measure a circuit’s frequency response
huskerscope actually has a 2-channel function Generator in it aswell. but duento the filter i now am working on an esp8266 based scope as i had the esp laying around.
